Article
Chemistry, Multidisciplinary
Yuhan Li, Milo S. P. Shaffer
Summary: This study demonstrates the novel use of confocal microscopy for high-resolution characterization, in situ laser reduction, and versatile patterning of graphene oxide (GO) films. The reduction process can be attributed to thermal transfer and accumulation, which can be controlled over multiple length scales. This technique allows for the fabrication of conductive reduced GO films and 3D microscale architectures, and provides a valuable tool for well-controlled and scalable fabrication.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Polymer Science
Kakur Naresh, Kamran A. Khan, Rehan Umer
Summary: This study investigated the effects of different graphene oxide concentrations on the mechanical and thermal properties of epoxy, proposing analytical models to predict Young's modulus and thermal conductivity. The 0.2 wt% nanocomposite samples showed relatively high storage modulus, heat-resistance index, and thermal conductivity compared to pure epoxy and lower concentration GO nanocomposites, indicating higher thermal stability.
Article
Chemistry, Physical
Ondrej Dyck, Jacob L. Swett, Charalambos Evangeli, Andrew R. Lupini, Jan A. Mol, Stephen Jesse
Summary: Graphene is proposed for various nanodevice designs, but faces challenges in visualization, measurement, and manipulation at nanometer and atomic scales. This study demonstrates the use of SEEBIC imaging technique to visualize conductance and connectivity in graphene nanodevices, as well as detect subtle differences in charge transport.
Article
Materials Science, Multidisciplinary
Simon Hettler, David Sebastian, Mario Pelaez-Fernandez, Ana M. Benito, Wolfgang K. Maser, Raul Arenal
Summary: Graphene oxide (GO) is reduced by Joule heating using in-situ transmission electron microscopy (TEM), allowing the study of its conductivity, composition, and structural properties throughout the reduction process. The small changes in GO properties observed at low applied electric currents are attributed to diffusion processes. The actual reduction process starts at an applied power density of about 2 x 10(14) Wm(-3), resulting in a significant increase in conductivity.
Article
Materials Science, Multidisciplinary
Zhehan Ying, Jiangyong Diao, Shi Wang, Xiangbin Cai, Yuan Cai, Hongyang Liu, Ning Wang
Summary: The study revealed that surface flatness of graphene-based supports plays a crucial role in the thermal stability of metal nanocatalysts, and microstructural transformations can affect the coarsening process of PtNPs.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Mahmound Tamadoni Saray, Vitaliy Yurkiv, Reza Shahbazian-Yassar
Summary: Ultrafast heating accelerates the synthesis processes and controls the morphology of nanoparticles. This study investigates the formation of nickel nanoparticles on graphene oxide substrates under slow and ultrafast heating rates. The results show that the structure of graphene oxide plays a crucial role in stabilizing hexagonally close-packed nickel nanoparticles during ultrafast heating. In contrast, face-centered cubic nickel nanoparticles are formed under slow heating without a strong correlation with the substrate structure. Additionally, ultrafast heating leads to smaller-size nanoparticles due to rapid reduction, nucleation rate, and higher diffusion barrier. However, the crystal structure stability of nickel nanoparticles is unaffected by their size. These findings highlight the importance of the substrate in controlling the crystal structure during nonequilibrium processing and the competing effects of thermodynamics and kinetics in creating novel phases for energy storage and conversion applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Thermodynamics
Ding-Jun Huang, Wei-Tsu Peng, Yen-Ta Lee, Ming-Chang Lu
Summary: A high-quality reduced graphene oxide (rGO) film was synthesized using a chemical-thermal method at a low temperature, which exhibited excellent thermal conductivity. It was found that the rGO film could effectively dissipate heat and reduce hotspot temperature and thermal spreading resistance when applied to electronic chips.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Xiaoqin Yang, Huy Q. Ta, Wei Li, Rafael G. Mendes, Yu Liu, Qitao Shi, Sami Ullah, Alicja Bachmatiuk, Jinping Luo, Lijun Liu, Jin-Ho Choi, Mark H. Rummeli
Summary: Ongoing research explores the potential of Sn atoms to form freestanding stanene and/or Sn patches in graphene pores. Experimental observations show novel single-atom thick 2D planar clusters/patches ranging from 1 to 8 atoms within the graphene pores, with patches of three or more atoms adopting star-like or close-packed structural configurations. Density functional theory calculations indicate deviations from experiment for 2D patches larger than five atoms due to interfacial interactions between graphene pore edges and Sn atoms, advancing the development of single-atom thick 2D elemental metal membranes.
Article
Chemistry, Multidisciplinary
Mahmound Tamadoni Saray, Vitaliy Yurkiv, Reza Shahbazian-Yassar
Summary: Understanding the thermal decomposition of metal salt precursors on carbon structures is crucial for synthesizing metal-decorated carbon nanomaterials. In this study, the thermolysis of NiCl2·6H2O on amorphous carbon (a-C) and graphene oxide (GO) substrates was investigated using in situ transmission electron microscopy. The results showed that the thermal decomposition of NiCl2·6H2O on GO occurred at higher temperatures and slower kinetics compared to the a-C substrate. The different behaviors were attributed to the higher activation barrier for Cl-2 removal, strong Ni-GO interaction, high-density oxygen functional groups, defects, and weak van der Waals force on the GO substrate.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jialin Zhang, Yuan Ji, Huating Liu, Ningyan Cheng, Siqi Guo, Ming Yang, Long Ren, Binghui Ge
Summary: Atomic understanding of chemical reactions enables programmable design and synthesis of desired products. In situ transmission electron microscopy (TEM) techniques, combined with first-principle calculations, are used to monitor the carbothermal reduction (CTR) reactions and reveal the migration route of Co atoms during phase transition and the effect of interfacial edge-dislocations/stress-gradient on morphology variation. Controllable synthesis of Co-based nanostructures with desirable phase and structure is achieved, providing insights into CTR reactions and offering a novel strategy for designing functional nanostructures in emerging energy technologies.
Article
Multidisciplinary Sciences
Lukas Grote, Martin Seyrich, Ralph Dohrmann, Sani Y. Harouna-Mayer, Federica Mancini, Emilis Kaziukenas, Irene Fernandez-Cuesta, Cecilia A. Zito, Olga Vasylieva, Felix Wittwer, Michal Odstrczil, Natnael Mogos, Mirko Landmann, Christian G. Schroer, Dorota Koziej
Summary: Understanding morphological changes of nanoparticles in solution is crucial for tailoring the functionality of energy devices. However, there is a lack of experimental methods that can visualize these processes in solution and provide three-dimensional information. This study demonstrates the use of X-ray ptychography for in situ 3D imaging of the formation and hollowing of nanoparticles in solution at high temperature.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jatin J. Patil, Zhengmao Lu, Michael J. Zachman, Ningxin Chen, Kimberly S. Reeves, Asmita Jana, Griselda Revia, Brandon MacDonald, Brent D. Keller, Edgar Lara-Curzio, Jeffrey C. Grossman, Nicola Ferralis
Summary: Graphene oxide (GO) is a promising membrane material that can be used for chemical separations, including water treatment. However, often chemical modifications are needed to improve the permeability, performance, or mechanical integrity of GO membranes. In this study, we explore two different feedstocks of GO and observe significant improvements in permeability and chemical stability. These findings are connected to differences in sheet stacking and oxide functional groups through various characterization approaches.
Article
Chemistry, Physical
Meryem Samanci, Ayse Bayrakceken Yurtcan
Summary: Reduced graphene oxide (RGO) has been synthesized as carbon sourced catalyst support materials for Polymer Electrolyte Membrane (PEM) fuel cells. Pt catalysts were synthesized using supercritical carbon dioxide deposition technique over the synthesized support materials. The structures of thermally and chemically reduced graphene oxide supports and their Pt catalysts were investigated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Applied
Pankaj Kumar Singh, Kamal Sharma, Pradeep Kumar Singh
Summary: The objective of this study is to electrochemically synthesize graphene in the presence of a magnetic field. The applied magnetic field significantly affects the surface height, roughness, microstructure, and surface state of the synthesized graphene. However, it has little effect on the phase, lattice parameter, and thermal stability.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Chemistry, Physical
Jin-Su Oh, Xiaotian Fang, Tae-Hoon Kim, Matt Lynn, Matt Kramer, Mehdi Zarea, James A. Sauls, Alexander Romanenko, Sam Posen, Anna Grassellino, Cameron J. Kopas, Mark Field, Jayss Marshall, Hilal Cansizoglu, Kameshwar Yadavalli, Joshua Y. Mutus, Matthew Reagor, Lin Zhou
Summary: Niobium is widely used in superconducting quantum systems, but structural defects at the interface may lead to performance degradation. This study investigated the decomposition mechanism of surface oxide on Nb films on Si wafers, and found that heat treatment resulted in the formation of Nb nanograins in an amorphous Nb-O matrix. The interface between Nb and the surface oxide layer remained relatively unchanged, providing insights for optimizing superconducting qubit devices.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Marcos G. Farpon, Wilson Henao, Philipp N. Plessow, Eva Andres, Raul Arenal, Carlo Marini, Giovanni Agostini, Felix Studt, Gonzalo Prieto
Summary: A frontier challenge in single-atom catalysis is the design of fully inorganic sites that can emulate the high reaction selectivity of organometallic counterparts in homogeneous catalysis. Modulating the direct coordination environment in single-atom sites through the use of the oxide support's surface chemistry is a powerful strategy that has been underexplored. In this study, isolated Rh atoms stabilized on oxygen-defective SnO2 exhibited excellent TOF and nearly full selectivity in the gas-phase hydroformylation of ethylene, surpassing the thermodynamically favored olefin hydrogenation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Applied
Javier Hernandez-Ferrer, Mario Gracia-Martin, Ana M. Benito, Wolfgang K. Maser, Enrique Garcia-Bordeje
Summary: ZIF8 was pyrolyzed at different temperatures and with adsorption of minor amounts of Co precursor, and the effect of carbonization temperature on texture, composition and ORR performance was systematically studied. Increasing pyrolysis temperature decreased N content but increased graphitic character. The trade-off between these two parameters resulted in an improvement of ORR performance, especially at 1000 oC. The adsorption of Co precursor further enhanced ORR performance, graphitic character and porosity of the resulting carbon material.
Article
Chemistry, Multidisciplinary
Michail P. Minadakis, Ruben Canton-Vitoria, Christina Stangel, Emmanuel Klontzas, Raul Arenal, Javier Hernandez-Ferrer, Ana M. Benito, Wolfgang K. Maser, Nikos Tagmatarchis
Summary: This study reports on the covalent functionalization of tungsten disulfide (WS2) with photo- and electro-active nickel-porphyrin (NiP). The hybrid material WS2-NiP is characterized using spectroscopic, microscopic, and thermal techniques, and evaluated for its electrocatalytic behavior using advanced electrochemical techniques. The observed photo-enhanced electrocatalytic activity is attributed to the presence of Ni centers coordinated by tethered porphyrin derivative chains, which serve as photoreceptors. This pioneering work opens up new possibilities for water oxidation and the development of non-noble metal electrocatalysts.
Article
Chemistry, Analytical
A. Anson-Casaos, C. Martinez-Baron, S. Angoy-Benabarre, J. Hernandez-Ferrer, A. M. Benito, W. K. Maser, M. J. Blesa
Summary: This work evaluates a novel metal-free donor-x-acceptor dye (AT-Pyri) for sensitizing TiO2 film photoanodes, demonstrating significant improvement in photocurrent and stability. The addition of triethanolamine (TEOA) to the electrolyte prevents degradation of AT-Pyri, and combining TEOA with methanol further enhances the photoelectrochemical water-splitting activity. The stabilization of the AT-Pyri photoanode is accompanied by a substantial increase in photocurrent and disappearance of transient spikes.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Lisa Royer, Antoine Bonnefont, Tristan Asset, Benjamin Rotonnelli, Juan-Jesus Velasco-Velez, Steven Holdcroft, Simon Hettler, Raul Arenal, Benoit Pichon, Elena Savinova
Summary: Transition metal oxides show promise as cost-effective catalysts for oxygen evolution reaction (OER) in alkaline media. However, understanding the transformations occurring under harsh oxidative OER conditions is crucial for developing stable and active catalysts. This study used NEXAFS spectroscopy to investigate the redox transformations of core-shell Fe3O4@CoFe2O4 oxide nanoparticles over a range of potentials. The analysis revealed that the Fe3O4 core significantly influences the surface chemistry of the CoFe2O4 shell during OER, with the Co (II) structure preserved even at high potentials where Co (II) is expected to be oxidized into Co (III), while Fe (II) in the core undergoes reversible oxidation to Fe (III).
Article
Polymer Science
Victor Calvo, Miguel A. Alvarez Sanchez, Lucas Guemes, Carlos Martinez-Baron, Sandra Baulde, Alejandro Criado, Jose M. Gonzalez-Dominguez, Wolfgang K. Maser, Ana M. Benito
Summary: In this study, we examined a set of parameters for cellulose nanocrystal synthesis using one-pot acid hydrolysis and assessed their impact on yield, purity, and repeatability. We also demonstrated the feasibility of using dynamic light scattering as a nondestructive and accurate method for analyzing the synthesis outcome. Ultimately, we developed an improved protocol to obtain each allomorph with mass yields of 25% for type I and 40% for type II, with emphasis on reducing environmental impact and overall preparation time.
Article
Chemistry, Multidisciplinary
Antonia Kagkoura, Christina Stangel, Raul Arenal, Nikos Tagmatarchis
Summary: Functionalized molybdenum diselenide (MoSe2) and tungsten diselenide (WSe2) were synthesized via metal-ligand coordination and subsequent covalent grafting of a cobalt-porphyrin. The resulting hybrid materials exhibited enhanced activity for electrocatalytic hydrogen evolution reaction compared to pristine MoSe2 and WSe2. The modification route provides a versatile functionalization procedure for other transition metal dichalcogenides and opens new pathways for functional nanomaterials in electrocatalysis.
Article
Chemistry, Multidisciplinary
Assael Cohen, Pranab K. Mohapatra, Simon Hettler, Avinash Patsha, K. V. L. V. Narayanachari, Pini Shekhter, John Cavin, James M. Rondinelli, Michael Bedzyk, Oswaldo Dieguez, Raul Arenal, Ariel Ismach
Summary: Conventional epitaxy is essential for semiconductor technology, but there are still unresolved differences in terms of orientation registry and interface chemistry in quasi-vdW epitaxy. This study focuses on the growth of WS2 using metal-organic chemical vapor deposition (MOCVD) and a metal-seeding approach, which allows for the formation of a continuous WO3 layer on a sapphire substrate. The presence of this interfacial layer strongly influences the subsequent growth of the WS2 layer. This work provides insights into the epitaxial growth mechanism and demonstrates the effectiveness of the metal-seeding approach for the growth of other TMDC layers.
Article
Chemistry, Physical
Eduardo Colom, Javier Hernandez-Ferrer, Alejandro Galan-Gonzalez, Alejandro Anson-Casaos, Mario Navarro-Rodriguez, Elisa Palacios-Lidon, Jaime Colchero, Javier Padilla, Antonio Urbina, Raul Arenal, Ana M. Benito, Wolfgang K. Maser
Summary: Nanoparticles of conjugated polymers in contact with graphene oxide sheets were prepared using a miniemulsion synthesis approach. This led to a unique conformation of the polymer chains and an unprecedented charge transfer between the two constituents. The resulting nanohybrid enabled direct and efficient charge extraction through the graphene oxide sheets.
CHEMISTRY OF MATERIALS
(2023)
Article
Microscopy
Robin Cours, Germercy Paredes, Aurelien Masseboeuf, Thierry Ondarcuhu, Gregory Seine, Pascal Puech, Raul Arenal, Fabrice Piazza, Marc Monthioux
Summary: Graphenic carbon morphologies grown on carbon nanotubes (CNTs) with sharp micro-/nano-cones at both ends were used as probes for scanning probe microscopies (SPM). Three mounting procedures were tested, and their benefits and drawbacks were described in details. The sensitivity of the carbon cones to ion and electron irradiation was investigated, and their suitability as SPM probes was demonstrated.
Article
Chemistry, Multidisciplinary
Aziz Genc, Javier Patarroyo, Jordi Sancho-Parramon, Raul Arenal, Neus G. Bastus, Victor Puntes, Jordi Arbiol
Summary: Morphological control is essential for fabricating nanostructures with desired plasmonic properties. This study investigates the nanoengineering of plasmon resonances in AuAg nanotubes, including completely hollow nanotubes and hybrid nanotubes with solid Ag and hollow AuAg segments. Both experiments and simulations show that plasmon resonances are strongly present inside the nanotubes due to plasmon hybridization. The hybrid AuAg nanotubes exhibit distinctive plasmonic features, allowing for a broad range of plasmon resonances and the modulation of asymmetrical plasmon distributions.
Article
Chemistry, Physical
Lisa Royer, Iryna Makarchuk, Simon Hettler, Raul Arenal, Tristan Asset, Benjamin Rotonnelli, Antoine Bonnefont, Elena Savinova, Benoit P. Pichon
Summary: Water electrolysis is a promising method for renewable energy storage, and recent advancements in anion exchange membranes have led to the development of high-performance anode catalysts based on transition metal oxides for oxygen evolution reaction. Core-shell nanoparticles combining an electrocatalytic shell with a conductive core have shown exceptional activity for oxygen evolution, suggesting synergistic interaction between the two components. The size of the conductive core also plays a critical role in enhancing the oxygen evolution reaction.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Biochemical Research Methods
Marta Lafuente, Fernando Almazan, Eduardo Bernad, Ileana Florea, Raul Arenal, Miguel A. Urbiztondo, Reyes Mallada, Maria P. Pina
Summary: To address the capability gaps in real-time detection and monitoring of neurotoxic gases, this work develops robust and reusable SERS microfluidic chips. The chips, integrated with a 3D plasmonic architecture, demonstrate excellent performance in the label-free detection and monitoring of 2.5 ppmV gaseous DMMP.
Article
Polymer Science
Victor Calvo, Miguel A. . Alvarez Sanchez, Lucas Gumas, Carlos Martinez-Baron, Sandra Bauld, Alejandro Criado, Jose M. Gonzalez-Dominguez, Wolfgang K. . Maser, Ana M. Benito
Summary: This study investigates in detail a set of parameters for the synthesis of cellulose nanocrystals (CNCs) using one-pot acid hydrolysis and evaluates their impact on the outcome in terms of yield, purity, and repeatability. The use of dynamic light scattering as an alternative to traditional structural analysis methods is also demonstrated. An improved protocol is provided to reliably obtain each allomorph of CNCs.
Article
Materials Science, Multidisciplinary
Antonio Canovas-Saura, Eduardo Colom, Javier Padilla, Antonio Urbina, Wolfgang K. Maser, Ana M. Benito
Summary: Nanoparticles of poly(3-hexylthiophene) (P3HT(NP)) enable the stable preparation of liquid phase electrochromic device structures with consistent and high performance. The nanoparticle films exhibit solvent-independent electrochromic characteristics, which can be attributed to the formation of a homogeneous porous structure on the substrate.
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.
